Message-ID: <68217e10.050a0220.f2294.004c.GAE@google.com>
Date: Sun, 11 May 2025 21:50:24 -0700
From: syzbot <syzbot+873424263816aca3b472@...kaller.appspotmail.com>
To: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, 
	kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
	pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] WARNING in neigh_parms_release

Hello,

syzbot found the following issue on:

HEAD commit:    707df3375124 Merge tag 'media/v6.15-2' of git://git.kernel..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=145e98f4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=925afd2bdd38a581
dashboard link: https://syzkaller.appspot.com/bug?extid=873424263816aca3b472
compiler:       arm-linux-gnueabi-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/98a89b9f34e4/non_bootable_disk-707df337.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/abde9f240928/vmlinux-707df337.xz
kernel image: https://storage.googleapis.com/syzbot-assets/756b0378e0b9/zImage-707df337.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+873424263816aca3b472@...kaller.appspotmail.com

veth1_macvtap: left promiscuous mode
veth0_macvtap: left promiscuous mode
veth1_vlan: left promiscuous mode
veth0_vlan: left promiscuous mode
------------[ cut here ]------------
WARNING: CPU: 1 PID: 22523 at lib/ref_tracker.c:228 ref_tracker_free+0x190/0x298 lib/ref_tracker.c:228
Modules linked in:
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 1 UID: 0 PID: 22523 Comm: kworker/u8:3 Not tainted 6.15.0-rc5-syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
Workqueue: netns cleanup_net
Call trace: 
[<802019e4>] (dump_backtrace) from [<80201ae0>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:00000000 r6:828227fc r5:00000000 r4:82257c34
[<80201ac8>] (show_stack) from [<80220020>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201ac8>] (show_stack) from [<80220020>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:120)
[<8021ffcc>] (dump_stack_lvl) from [<80220060>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r5:00000000 r4:82a70d4c
[<80220048>] (dump_stack) from [<802025f8>] (panic+0x120/0x374 kernel/panic.c:354)
[<802024d8>] (panic) from [<802619e8>] (check_panic_on_warn kernel/panic.c:243 [inline])
[<802024d8>] (panic) from [<802619e8>] (get_taint+0x0/0x1c kernel/panic.c:238)
 r3:8280c604 r2:00000001 r1:8223e7fc r0:822462fc
 r7:809673f4
[<80261974>] (check_panic_on_warn) from [<80261b4c>] (__warn+0x80/0x188 kernel/panic.c:749)
[<80261acc>] (__warn) from [<80261dcc>] (warn_slowpath_fmt+0x178/0x1f4 kernel/panic.c:776)
 r8:00000009 r7:822b2274 r6:e06e9b54 r5:84151800 r4:00000000
[<80261c58>] (warn_slowpath_fmt) from [<809673f4>] (ref_tracker_free+0x190/0x298 lib/ref_tracker.c:228)
 r10:00000000 r9:84a31b00 r8:84f63c00 r7:00000000 r6:00000000 r5:854c5988
 r4:84ce19cc
[<80967264>] (ref_tracker_free) from [<8155d35c>] (netdev_tracker_free include/linux/netdevice.h:4351 [inline])
[<80967264>] (ref_tracker_free) from [<8155d35c>] (netdev_put include/linux/netdevice.h:4368 [inline])
[<80967264>] (ref_tracker_free) from [<8155d35c>] (netdev_put include/linux/netdevice.h:4364 [inline])
[<80967264>] (ref_tracker_free) from [<8155d35c>] (neigh_parms_release+0x7c/0xc4 net/core/neighbour.c:1709)
 r8:84f63c00 r7:00000000 r6:00000000 r5:84ce1680 r4:854c5980
[<8155d2e0>] (neigh_parms_release) from [<81804d0c>] (addrconf_ifdown+0x6ac/0x764 net/ipv6/addrconf.c:4008)
 r5:84f63b84 r4:84f63c00
[<81804660>] (addrconf_ifdown) from [<8180aee0>] (addrconf_notify+0x98/0x770 net/ipv6/addrconf.c:3777)
 r10:e06e9d90 r9:84a67000 r8:8180ae48 r7:00000006 r6:84a31b00 r5:84f63c00
 r4:84c9e000
[<8180ae48>] (addrconf_notify) from [<802926cc>] (notifier_call_chain+0x60/0x1b4 kernel/notifier.c:85)
 r10:e06e9d90 r9:84a67000 r8:8180ae48 r7:00000000 r6:ffffffd1 r5:829e490c
 r4:829e5764
[<8029266c>] (notifier_call_chain) from [<80292904>] (raw_notifier_call_chain+0x20/0x28 kernel/notifier.c:453)
 r10:00000000 r9:84a67000 r8:847e6080 r7:00000000 r6:84a31b00 r5:00000006
 r4:e06e9d90
[<802928e4>] (raw_notifier_call_chain) from [<8154bb5c>] (call_netdevice_notifiers_info+0x54/0xa0 net/core/dev.c:2176)
[<8154bb08>] (call_netdevice_notifiers_info) from [<81557090>] (call_netdevice_notifiers_extack net/core/dev.c:2214 [inline])
[<8154bb08>] (call_netdevice_notifiers_info) from [<81557090>] (call_netdevice_notifiers net/core/dev.c:2228 [inline])
[<8154bb08>] (call_netdevice_notifiers_info) from [<81557090>] (unregister_netdevice_many_notify+0x54c/0xbc4 net/core/dev.c:11982)
 r6:00000001 r5:84c9e000 r4:000000c0
[<81556b44>] (unregister_netdevice_many_notify) from [<8155846c>] (unregister_netdevice_many net/core/dev.c:12046 [inline])
[<81556b44>] (unregister_netdevice_many_notify) from [<8155846c>] (default_device_exit_batch+0x304/0x384 net/core/dev.c:12538)
 r10:e06e9e70 r9:829d1ec4 r8:e06e9e90 r7:82c1f980 r6:e06e9e70 r5:84a31bf8
 r4:84a31afc
[<81558168>] (default_device_exit_batch) from [<81539c88>] (ops_exit_list+0x64/0x68 net/core/net_namespace.c:177)
 r10:84914380 r9:829d1ec4 r8:829d1ec4 r7:e06e9e90 r6:829d2584 r5:e06e9e90
 r4:829d2584
[<81539c24>] (ops_exit_list) from [<8153c0e8>] (cleanup_net+0x2b0/0x49c net/core/net_namespace.c:654)
 r7:e06e9e90 r6:829d1e80 r5:82c1f940 r4:829d2584
[<8153be38>] (cleanup_net) from [<802873bc>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3238)
 r10:8300f070 r9:8301bc15 r8:84151800 r7:8300e600 r6:8301bc00 r5:829d1e98
 r4:85556800
[<80287208>] (process_one_work) from [<80288004>] (process_scheduled_works kernel/workqueue.c:3319 [inline])
[<80287208>] (process_one_work) from [<80288004>] (worker_thread+0x1fc/0x3d8 kernel/workqueue.c:3400)
 r10:61c88647 r9:84151800 r8:8555682c r7:82804d40 r6:8300e600 r5:8300e620
 r4:85556800
[<80287e08>] (worker_thread) from [<8028f074>] (kthread+0x12c/0x280 kernel/kthread.c:464)
 r10:00000000 r9:85556800 r8:80287e08 r7:eb221e60 r6:85556e00 r5:84151800
 r4:00000001
[<8028ef48>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xe06e9fb0 to 0xe06e9ff8)
9fa0:                                     00000000 00000000 00000000 00000000
9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8028ef48
 r4:8556ee80
Rebooting in 86400 seconds..


---
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